There may be overlap in usage or not quite clear distinctions between the terms "chocolate wafer cookie" which evokes for some of us Voortman or Elite (Dutch, Israeli) cookie finger-shaped multilayer stick cookies with a waffle pattern and chocolate filling and "chocolate sandwich cookies" which evoke round chocolate discs with white filling (like Nabisco/American Oreo cookies).
Maybe use both terms in searching...

The Brown Eyed Baker has one that a friend of mine used. It had that Oreo crunch that a lot of them are missing. If you google "Oreo cookie copycat", you'll find it. My friend tried two others and I think Joy The Baker was one, but not positive.

They turned out chewy for me, but if you're looking for them to make crumbs for a cheesecake or an ice cream cake, they crumb well in the food processor. They didn't stick together at all and it is super humid here today.